KR20240042311A - Color control member and display device including the same - Google Patents

Abstract

The color control member of one embodiment may include a light control layer including quantum dots, a color filter layer disposed on the light control layer, and a low refractive index layer disposed between the color filter layer and the light control layer. The low refractive index layer may include a base resin, a plurality of non-hollow inorganic particles dispersed in the base resin and filled inside, and a void portion derived from a porogen. Based on the total weight of the low refractive layer, the weight of the base resin may be 40 wt% or more and 45 wt% or less, and the weight of the non-hollow inorganic particles may be 40 wt% or more and 45 wt% or less based on the total weight of the low refractive layer. A color control member including a low refractive index layer can exhibit excellent reliability.

Description

Color control member and display device including same {COLOR CONTROL MEMBER AND DISPLAY DEVICE INCLUDING THE SAME}

The present invention relates to a color control member including a low refractive index layer and a display device including the same.

Various display devices are being developed to provide image information in multimedia devices such as televisions, mobile phones, tablet computers, navigation devices, game consoles, etc. In particular, quantum dots are being introduced to improve display quality in display devices including liquid crystal display devices and organic light emitting display devices.

Additionally, a low refractive index layer is being introduced to enable display devices containing quantum dots to exhibit improved light efficiency characteristics. The low refractive layer contains hollow inorganic particles, etc., and moisture and gas flow into the hollow inorganic particles, which reduces the reliability of the display device.

An object of the present invention is to provide a color control member with improved reliability of a low refractive index layer disposed between a light control layer and a color filter layer, and a display device including the same.

One embodiment includes a light control layer including quantum dots; a color filter layer disposed on the light control layer; and a low refractive index layer disposed between the color filter layer and the light control layer. It includes, and the low refractive index layer is a base resin; A plurality of non-hollow inorganic particles dispersed in the base resin and filled inside; and a void portion derived from porogen; It includes, based on the total weight of the low refractive layer, the weight of the base resin is 40wt% or more and 45wt% or less, and the weight of the non-hollow inorganic particles is 40wt% or more and 45wt% based on the total weight of the low refractive layer. % or less is provided.

The low refractive index layer may not include hollow inorganic particles.

The void portion may have a spherical shape.

Each of the non-hollow inorganic particles may have a diameter of 10 nm or more and 30 nm or less.

Based on the total weight of the low refractive layer, the porogen may be provided in an amount of 10 wt% or more and 20 wt% or less.

The porogen may be thermally decomposed to form the void portion.

The refractive index of the low refractive layer may be 1.21 or more and 1.25 or less.

The haze value of the low refractive layer may be less than 0.40%.

The base resin may include at least one of acrylic resin, silicone resin, epoxy resin, urethane resin, and imide resin.

The non-hollow inorganic particles may include at least one of SiO ₂ , MgF ₂ , and Fe ₃ O ₄ .

The refractive index of the non-hollow inorganic particles may be 1.43 or more and 1.46 or less.

The functional group of the base resin may be bonded to the surface of the non-hollow inorganic particle.

The refractive index of the low refractive index layer may be smaller than the refractive index of the light control layer.

One embodiment includes a display device layer; and a color control member disposed on the display element layer. and wherein the color control member includes a light control layer including quantum dots; a color filter layer disposed on the light control layer; and a low refractive index layer disposed between the color filter layer and the light control layer. It includes, and the low refractive index layer is a base resin; A plurality of non-hollow inorganic particles dispersed in the base resin and filled inside; and a void portion derived from porogen; It includes, based on the total weight of the low refractive layer, the weight of the base resin is 40wt% or more and 45wt% or less, and the weight of the non-hollow inorganic particles is 40wt% or more and 45wt% based on the total weight of the low refractive layer. % or less display device is provided.

The low refractive index layer may not include hollow inorganic particles.

The refractive index of the low refractive layer may be 1.21 or more and 1.25 or less.

Each of the non-hollow inorganic particles may have a diameter of 10 nm or more and 30 nm or less.

The display device layer includes a light-emitting device that emits first light, and the light control layer includes a first light control unit including a first quantum dot that converts the first light into second light, and a first light control layer that converts the first light into second light. It may include a second light control unit that converts the light into three lights, and a third light control unit that transmits the first light.

The color filter layer may include a first filter corresponding to the first light control unit, a second filter corresponding to the second light control unit, and a third filter corresponding to the third light control unit.

The first light is blue light, the first quantum dot can convert the blue light into red light, and the second quantum dot can convert the blue light into green light.

A color control member of one embodiment and a display device including the same may exhibit excellent reliability by including a low refractive index layer including a void portion derived from non-hollow inorganic particles and porogen filled inside.

1 is a perspective view showing a display device according to an embodiment.
Figure 2 is a cross-sectional view showing a portion corresponding to line II' in Figure 1.
Figure 3 is a plan view showing a portion of a display device according to an embodiment.
Figure 4 is a cross-sectional view showing a portion corresponding to line II-II' in Figure 3.
Figure 5 is an enlarged cross-sectional view of area AA' of Figure 4.
Figure 6 shows a portion of a color control member according to one embodiment.
Figure 7a is an image taken under a microscope of the color control member of the comparative example.
Figure 7b is an image taken under a microscope of the color control member of the comparative example.
Figure 8 is a graph showing the strength of the low refractive layer according to the diameter of non-hollow inorganic particles.
Figure 9 is a graph showing the refractive index of the low refractive index layer according to the weight of porogen.
Figure 10 is a graph showing the strength of the low refractive layer according to the weight of non-hollow inorganic particles.
Figure 11 is a graph showing the refractive index of the low refractive layer according to the weight of non-hollow inorganic particles.
Figure 12 is a graph showing the haze value of the low refractive index layer according to the diameter of non-hollow inorganic particles.
Figure 13 is a graph showing the SCE reflectance of the low refractive index layer according to the diameter of the non-hollow inorganic particle.

Since the present invention can be subject to various changes and have various forms, specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific disclosed form, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

In this specification, when a component (or region, layer, portion, etc.) is referred to as being “on,” “connected to,” or “coupled to” another component, it is directly placed/on the other component. This means that they can be connected/combined or a third component can be placed between them.

Like reference numerals refer to like elements. Additionally, in the drawings, the thickness, proportions, and dimensions of components are exaggerated for effective explanation of technical content. “And/or” includes all combinations of one or more that can be defined by the associated components.

Terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, a first component may be named a second component, and similarly, the second component may also be named a first component without departing from the scope of the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

Additionally, terms such as “below,” “on the lower side,” “above,” and “on the upper side” are used to describe the relationship between components shown in the drawings. The above terms are relative concepts and are explained based on the direction indicated in the drawings.

Terms such as “include” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but do not include one or more other features, numbers, or steps. , it should be understood that this does not exclude in advance the possibility of the presence or addition of operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms (including technical terms and scientific terms) used in this specification have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains. Additionally, terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant technology, and unless explicitly defined herein, should not be interpreted as having an overly idealistic or overly formal meaning. It shouldn't be.

Hereinafter, a color control member and a display device including the same according to an embodiment will be described with reference to the drawings. 1 is a perspective view showing a display device according to an embodiment. Figure 2 is a cross-sectional view showing a portion corresponding to line II' of Figure 1.

The display device DD in one embodiment may be a device that is activated according to an electrical signal. For example, the display device DD may be, but is not limited to, a television, an external billboard, a portable electronic device, a tablet, a car navigation system, a game console, a personal computer, a laptop computer, or a wearable device.

The display device DD may include a display surface DD-IS. The thickness direction of the display device DD may be parallel to the third direction DR3, which is a normal direction to the plane defined by the first and second directions DR1 and DR2. The directions indicated by the first to third direction axes DR1, DR2, and DR3 described in this specification are relative concepts and can be converted to other directions. Additionally, directions indicated by the first to third direction axes DR1, DR2, and DR3 may be described as first to third directions, and the same reference numerals may be used. In this specification, the front (or upper) and rear (or lower) surfaces of the members constituting the display device DD may be defined based on the third direction DR3. In this specification, the direction closer to the display surface DD-IS relative to the third direction axis DR3 refers to the upper part, and the direction away from the display surface DD-IS indicates the lower part. In this specification, “plane” refers to a plane parallel to the plane defined by the first and second directions DR1 and DR2 and perpendicular to the third direction DR3, and “cross section” refers to It refers to a side parallel to the third direction axis (DR3).

The display surface DD-IS may be parallel to a plane defined by the first and second directions DR1 and DR2. The display surface DD-IS may include a display area DA and a non-display area NDA. The display area DA may be an area where an image (or video) is displayed. The non-display area (NDA) may be an area where an image (or video) is not displayed. For example, the pixel PX may be disposed in the display area DA, and a plurality of wiring lines and driving circuits for driving the pixel PX may be disposed in the non-display area NDA.

The non-display area (NDA) may be defined along the border of the display surface (DD-IS). The non-display area (NDA) may surround the display area (DA). However, this is illustrative, and the embodiment is not limited thereto. For example, the non-display area NDA may be omitted, or the non-display area NDA may be placed only on one side of the display area DA.

Although FIG. 1 illustrates a display device DD having a flat display surface DD-IS, the present invention is not limited thereto. The display device DD may include a curved display surface or a three-dimensional display surface. A three-dimensional display screen may include a plurality of display areas pointing in different directions.

Referring to FIG. 2 , the display device DD may include a lower panel DPN and an upper panel UPN disposed on the lower panel DPN. Additionally, the display device DD may include a filling layer (FML) and a sealing portion (SLM) disposed between the lower panel (DPN) and the upper panel (UPN).

The sealing portion (SLM) may connect the lower panel (DPN) and the upper panel (UPN). The sealing portion (SLM) may be disposed in the non-display area (NDA) to combine the lower panel (DPN) and the upper panel (UPN). The encapsulation portion SLM is disposed in the non-display area NDA, which is an outer portion of the display device DD, and can prevent foreign substances, oxygen, and moisture from entering the display device DD from the outside. The sealing portion (SLM) may be formed from a sealant containing a curable resin. The sealant may contain an epoxy resin or an acrylic resin. Sealants may be thermoset or photocurable materials. In this specification, “~~-based” resin means containing a “~~” functional group.

The sealant may be provided on one side of the lower panel (DPN) or the upper panel (UPN). Thereafter, the lower panel (DPN) and the upper panel (UPN) are bonded so that they face each other, and the sealant is cured by providing heat or ultraviolet light to form a sealing portion (SLM).

The charging layer (FML) may be used to charge between the lower panel (DPN) and the upper panel (UPN) in the display area (DA) and the non-display area (NDA). The filled layer (FML) can function as a buffer. The filling layer (FML) can function as a shock absorber and increase the strength of the display device (DD). The filled layer (FML) may be formed from a filled resin containing a polymer resin. For example, the filled layer FML may be formed from a filled layer resin including an acrylic resin or an epoxy resin.

Meanwhile, unlike what is shown, the filling layer (FML) and the sealing portion (SLM) may be omitted. The filling layer (FML) and the sealing portion (SLM) may be omitted, and the upper panel (UPN) may be placed directly on the lower panel (DPN). In this specification, the fact that a component is placed directly on another component means that a third component is not placed between the component and the other component. When a component is 'directly placed' on another component, it means that the component is in 'contact' with the other component.

FIG. 3 is an enlarged plan view of a portion of the display device DD according to an embodiment. Figure 4 is a cross-sectional view showing a portion corresponding to line II-II' in Figure 3.

FIG. 3 may be an enlarged plan view of a portion of the display area DA in the display device DD. FIG. 3 exemplarily shows a plane including three pixel areas (PXA-R, PXA-B, and PXA-G) and a bank well area (BWA) adjacent thereto. The three pixel areas PXA-R, PXA-B, and PXA-G shown in FIG. 3 may be repeatedly arranged throughout the display area DA ( FIG. 1 ).

A peripheral area NPXA may be disposed around the first to third pixel areas PXA-R, PXA-B, and PXA-G. The peripheral area NPXA may set the boundaries of the first to third pixel areas PXA-R, PXA-B, and PXA-G. The peripheral area NPXA may surround the first to third pixel areas PXA-R, PXA-B, and PXA-G. The peripheral area NPXA includes a structure that prevents color mixing of the first to third pixel areas PXA-R, PXA-B, and PXA-G, for example, a pixel defining layer (PDL, FIG. 4) or a bank ( BMP, Figure 4), etc. may be deployed.

In FIG. 3 , the first to third pixel areas (PXA-R, PXA-B, and PXA-G) are shown to have the same shape on the plane and different areas on the plane, but the embodiment is not limited thereto. The areas of at least two of the first to third pixel areas (PXA-R, PXA-B, and PXA-G) may be the same. The areas of the first to third pixel areas (PXA-R, PXA-B, and PXA-G) may be set according to the color of the emitted light. Among the primary colors, the area of the pixel area that emits red light may be the largest, and the area of the pixel area that emits blue light may be the narrowest.

In FIG. 3, each of the first to third pixel areas (PXA-R, PXA-B, and PXA-G) is shown as having a rectangular shape in the plane. Alternatively, each of the first to third pixel areas (PXA-R, PXA-B, and PXA-G) may have a different polygonal shape, such as a rhombus or pentagon. Alternatively, each of the first to third pixel areas (PXA-R, PXA-B, and PXA-G) may have a rectangular shape with rounded corner areas. Meanwhile, the first to third pixel areas (PXA-R, PXA-B, and PXA-G) may have different shapes on a plane.

In FIG. 3, the second pixel area (PXA-G) is shown in the first row, and the first pixel area (PXA-R) and the third pixel area (PXA-B) are shown in the second row. However, this is an example, and the arrangement of the first to third pixel areas (PXA-R, PXA-B, and PXA-G) may be changed in various ways. For example, the first to third pixel areas (PXA-R, PXA-B, and PXA-G) may be arranged in the same row.

One of the first to third pixel areas (PXA-R, PXA-B, PXA-G) emits first light, another one emits second light different from the first light, and the other one emits second light different from the first light. may emit third light that is different from the first light and the second light. For example, the first pixel area (PXA-R) may emit red light, the second pixel area (PXA-G) may emit green light, and the third pixel area (PXA-B) may emit blue light. .

A bank well area (BWA) may be defined in the display area (DA, FIG. 1). The bank well area (BWA) may be an area formed to prevent defects due to miscalculation in the process of patterning the plurality of light control units (CCP1, CCP2, and CCP3) included in the light control layer (CCL, FIG. 4). . The bank well area (BWA) may be an area from which a portion of the bank (BMP, FIG. 4) is removed. 3 shows two bank well areas (BWA) formed adjacent to the second pixel area (PXA-G), but the embodiment is not limited thereto, and the shape and arrangement of the bank well area (BWA) can vary. can be changed.

Referring to FIG. 4, the lower panel (DPN) includes a base substrate (BS), a circuit layer (DP-CL) disposed on the base substrate (BS), and a display element layer disposed on the circuit layer (DP-CL). (DP-ED) may be included. The upper panel (UPN) may include a color control member (CCM) and a base layer (BL) disposed on the color control member (CCM).

The base substrate BS may be a member that provides a base surface on which the circuit layer DP-CL is disposed. The base substrate BS may include a single layer or multiple layers. For example, the base substrate BS may include a three-layer structure of a polymer resin layer, an adhesive layer, and a polymer resin layer. For example, the polymer resin layer may include polyimide-based resin. In addition, the polymer resin layer is acrylate-based resin, methacrylate-based resin, polyisoprene-based resin, vinyl-based resin, epoxy-based resin, and urethane-based resin. It may include at least one of resin, cellulose-based resin, siloxane-based resin, polyamide-based resin, and perylene-based resin. In this specification, polyimide-based resin means containing the functional group of polyimide. In addition, the same explanation is given for acrylate-based resin, methacrylate-based resin, polyisoprene-based resin, vinyl-based resin, epoxy-based resin, urethane-based resin, cellulose-based resin, siloxane-based resin, polyamide-based resin, and perylene-based resin. It can be applied.

The circuit layer (DP-CL) may include an insulating layer, a semiconductor pattern, a conductive pattern, and a signal line. The circuit layer DP-CL may include a plurality of transistors (not shown). Transistors (not shown) may each include a control electrode, an input electrode, and an output electrode. For example, the circuit layer (DP-CL) may include a switching transistor and a driving transistor for driving the light emitting device (ED) of the display device layer (DP-ED).

The display device layer (DP-ED) may include an organic light emitting device or a quantum dot light emitting device. That is, the display device layer (DP-ED) may include an organic light emitting material or quantum dots as a light emitting material. Additionally, the display device layer (DP-ED) may include a microscopic light emitting device. For example, the ultra-small light emitting device may include a micro LED device and/or a nano LED device. The ultra-small light emitting device may have a micro or nano scale size and may include an active layer disposed between a plurality of semiconductor layers.

For example, the light emitting element (ED) of the display element layer (DP-ED) includes a first electrode (EL1), a second electrode (EL2) facing the first electrode (EL1), and a first electrode (EL1). It may include a light emitting layer (EML) disposed between the second electrodes EL2. In addition, the light emitting device ED has a hole transport region (HTR) disposed between the first electrode (EL1) and the light emitting layer (EML), and an electron transport region (HTR) disposed between the light emitting layer (EML) and the second electrode (EL2) ETR) may be included.

The first electrode EL1 may be an anode or a cathode. Additionally, the first electrode EL1 may be a pixel electrode. The first electrode EL1 may be a transmissive electrode, a semi-transmissive electrode, or a reflective electrode. The second electrode EL2 may be a common electrode. The second electrode EL2 may be a cathode or an anode, but the embodiment is not limited thereto. For example, if the first electrode EL1 is an anode, the second electrode EL2 may be a cathode, and if the first electrode EL1 is a cathode, the second electrode EL2 may be an anode. The second electrode EL2 may be a transmissive electrode, a semi-transmissive electrode, or a reflective electrode.

Although not shown, a device capping layer may be provided on the second electrode EL2. The device capping layer (not shown) may be a single layer or a multilayer. The device capping layer (not shown) may include an alkali metal compound such as LiF, an alkaline earth metal compound such as MgF ₂ , and an inorganic material such as SiON, _SiN In contrast, the device capping layer (not shown) is α-NPD, NPB, TPD, m-MTDATA, Alq ₃ , CuPc, TPD15(N4,N4,N4',N4'-tetra (biphenyl-4-yl) biphenyl- 4,4'-diamine), TCTA (4,4',4"- Tris (carbazol-9-yl) triphenylamine), etc., or may contain organic substances such as epoxy resins or acrylates such as methacrylates. You can.

The light emitting layer (EML) may emit first light. For example, the light emitting layer (EML) can generate blue light. The light emitting layer (EML) can generate light in a wavelength range of 410 nm to 480 nm. Although FIG. 4 illustrates a light emitting device (ED) including one light emitting layer (EML), the light emitting device (ED) may include a plurality of light emitting layers. That is, the light emitting device ED may be a light emitting device with a tandem structure.

The hole transport region (HTR) includes a hole transport layer and may further include a hole injection layer and/or an electron blocking layer. The electron transport region (ETR) includes an electron transport layer and may further include an electron injection layer and/or a hole blocking layer.

Although FIG. 4 illustrates that the hole transport region (HTR), the light emitting layer (EML), and the electron transport region (ETR) are provided as a common layer, the embodiment is not limited thereto. For example, the hole transport region (HTR), the light emitting layer (EML), and/or the electron transport region (ETR) may be patterned and provided within the light emitting opening (OH) defined in the pixel defining layer (PDL). When the light-emitting layer is patterned and provided within the light-emitting opening OH, the light-emitting layer may emit light in different wavelength regions in the first to third pixel areas PXA-R, PXA-B, and PXA-G.

The display element layer (DP-ED) may include a pixel defining layer (PDL). The pixel defining layer (PDL) may be formed including a light-absorbing material, or may be formed including an organic light-blocking material or an inorganic light-blocking material including black pigment or black dye. The light emitting opening OH defined in the pixel defining layer PDL may expose at least a portion of the first electrode EL1. First to third light-emitting areas EA1, EA2, and EA3 may be defined by the light-emitting opening OH.

The first emission area (EA1), the second emission area (EA2), and the third emission area (EA3) may be areas divided by a pixel defining layer (PDL). The first emission area (EA1), the second emission area (EA2), and the third emission area (EA3) respectively correspond to the first pixel area (PXA-R), the second pixel area (PXA-G), and the third pixel area. It may correspond to each area (PXA-B). The emission areas EA1, EA2, and EA3 may overlap with the pixel areas PXA-R, PXA-G, and PXA-B and may not overlap with the bank well area BWA (FIG. 3). On a plane, the areas of the light emitting areas EA1, EA2, and EA3 may be smaller than the areas of the pixel areas PXA-R, PXA-G, and PXA-B. In this specification, the fact that a certain component corresponds to another component is not limited to the fact that the certain component and the other component have the same area and the same shape, and also includes cases where the certain component and the other component have the same area and/or shape.

The display device layer (DP-ED) may include an encapsulation layer (TFE) disposed on the second electrode EL2. The encapsulation layer (TFE) may include organic and/or inorganic materials. The encapsulation layer (TFE) may include at least one organic layer and at least one inorganic layer. For example, the encapsulation layer (TFE) may include a multilayer structure in which a first inorganic layer, an organic layer, and a second inorganic layer are sequentially stacked. The first inorganic layer and the second inorganic layer of the encapsulation layer (TFE) protect the light emitting device (ED) from external moisture and/or oxygen, and the organic layer of the encapsulation layer (TFE) protects the light emitting device from foreign substances introduced during the manufacturing process. (ED) defects can be prevented.

The base layer BL of the upper panel UPN may be a member that provides a base surface on which the color control member CCM is disposed. For example, the base layer BL may be a glass substrate, a metal substrate, or a plastic substrate. However, the embodiment is not limited to this, and the base layer BL may be an inorganic layer, an organic layer, or a composite material layer. Unlike what is shown, the base layer BL may be omitted in the display device DD of one embodiment. Although not shown, functional layers such as a semi-reflective layer, an anti-fingerprint layer, and a hard coating layer may be further disposed on the base layer BL.

The color control member (CCM) of one embodiment includes a light control layer (CCL) disposed on the display element layer (DP-ED), a color filter layer (CFL) disposed on the light control layer (CCL), and a light control layer ( It may include a low refractive index layer (LR) disposed between the CCL) and the color filter layer (CFL). In one embodiment, the low refractive index layer (LR) may include a plurality of non-hollow inorganic particles (AE, FIG. 5) filled inside. In one embodiment, the low refractive index layer (LR) does not include hollow hollow inorganic particles.

In this specification, a non-hollow inorganic particle means an inorganic particle in which the inside of the particle is filled, that is, the inside of the particle is not empty. As for hollow inorganic particles with empty interiors, moisture and/or gas flows into the hollow particles, causing defects such as stains in color control members containing hollow inorganic particles. Compared to hollow inorganic particles, non-hollow inorganic particles (AE, Figure 5) are provided at a relatively low cost. Accordingly, in one embodiment, the color control member (CCM) including a low refractive index layer (LR) including non-hollow inorganic particles (AE, Figure 5) prevents moisture and/or external gas from entering, Reliability can be improved. Additionally, a color control member (CCM) including a low refractive index layer (LR) including non-hollow inorganic particles (AE, FIG. 5) can reduce manufacturing costs. The low refractive layer (LR) will be described in more detail later with reference to FIG. 5.

The light control layer (CCL) may include first to third light control units (CCP1, CCP2, CCP3) and a bank (BMP). The first light control unit CCP1 is provided to correspond to the first pixel area PXA-R, the second light control unit CCP2 is provided to correspond to the second pixel area PXA-G, and the third light control unit (CCP3) may be provided to correspond to the third pixel area (PXA-B). The first to third light control units CCP1, CCP2, and CCP3 may be spaced apart from each other. The bank (BMP) may be disposed between the optical control units (CCP1, CCP2, and CCP3) that are spaced apart from each other. However, the embodiment is not limited to this, and at least a portion of the edges of the optical control units CCP1, CCP2, and CCP3 may overlap with the bank BMP.

BMP may include base resin and additives. The base resin may be made of various resin compositions, which may generally be referred to as binders. Additives may include coupling agents and/or photoinitiators. Additives may further include dispersants.

The bank (BMP) may include a black coloring agent to block light. The BMP may include black dye and/or black pigment mixed in the base resin. The black component may include carbon black, metals such as chromium, or oxides thereof.

The first light control unit CCP1 includes a first quantum dot (QD1) that converts the first light provided from the light emitting device ED into second light, and the second light control unit CCP2 converts the first light into third light. It may include a second quantum dot (QD2) that converts into light. The third light control unit CCP3 may transmit the first light. The first light control unit CCP1 may provide red light as the second light, and the second light control unit CCP2 may provide green light as the third light. The third light control unit CCP3 may transmit and provide blue light, which is the first light provided from the light emitting device ED. For example, the first quantum dot (QD1) may be a red quantum dot, and the second quantum dot (QD2) may be a green quantum dot.

The core of quantum dots (QD1, QD2) is a group II-VI compound, a group I-II-VI compound, a group II-IV-VI compound, a group I-II-IV-VI compound, a group III-VI compound, and a group I-III -Can be selected from group VI compounds, group III-V compounds, group III-II-V compounds, group II-IV-V compounds, group IV-VI compounds, group IV elements, group IV compounds, and combinations thereof.

Group II-VI compounds include binary compounds selected from the group consisting of CdSe, CdTe, CdS, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS and mixtures thereof; A ternary selected from the group consisting of CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS and mixtures thereof. small compounds; and a tetraelement compound selected from the group consisting of HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe, and mixtures thereof. Meanwhile, the Group II-VI compound may further include a Group I metal and/or a Group IV element. The Group I-II-VI compound may be selected from CuSnS or CuZnS, and the Group II-IV-VI compound may be selected from ZnSnS or the like. Group I-II-IV-VI compounds may be selected from tetraelement compounds selected from the group consisting of Cu ₂ ZnSnS ₂ , Cu ₂ ZnSnS ₄ , Cu ₂ ZnSnSe ₄ , Ag ₂ ZnSnS ₂ and mixtures thereof.

Group III-VI compounds may include binary compounds such as In ₂ S ₃ , In ₂ Se ₃ , ternary compounds such as InGaS ₃ , InGaSe ₃ , or any combination thereof.

Group I-III-VI compounds are three element compounds selected from the group consisting of AgInS, AgInS ₂ , CuInS, CuInS ₂ , AgGaS ₂ , CuGaS ₂ CuGaO ₂ , AgGaO ₂ , AgAlO ₂ and mixtures thereof, or AgInGaS ₂ , It may be selected from quaternary element compounds such as CuInGaS ₂ .

Group III-V compounds are binary compounds selected from the group consisting of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb and mixtures thereof, GaNP, GaNAs, GaNSb, GaPAs , a ternary compound selected from the group consisting of GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InGaP, InAlP, InNP, InNAs, InNSb, InPAs, InPSb and mixtures thereof, and GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb , GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, and mixtures thereof. Meanwhile, the group III-V compound may further include a group II metal. For example, InZnP or the like may be selected as the group III-II-V compound.

The group II-IV-V compound may be a ternary compound selected from the group consisting of ZnSnP, ZnSnP2, ZnSnAs2, ZnGeP2, ZnGeAs2, CdSnP2, and CdGeP2 and mixtures thereof.

Group IV-VI compounds include binary compounds selected from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe, and mixtures thereof; A ternary compound selected from the group consisting of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe and mixtures thereof; and a quaternary element compound selected from the group consisting of SnPbSSe, SnPbSeTe, SnPbSTe, and mixtures thereof. Group IV elements may be selected from the group consisting of Si, Ge, and mixtures thereof. The group IV compound may be a binary compound selected from the group consisting of SiC, SiGe, and mixtures thereof.

At this time, the di-element compound, tri-element compound, or quaternary compound may exist in the particle at a uniform concentration, or may exist in the same particle with a partially different concentration distribution. Additionally, one quantum dot may have a core/shell structure surrounding other quantum dots. In a core/shell structure, there may be a concentration gradient in which the concentration of elements present in the shell decreases toward the core.

In some embodiments, quantum dots (QD1, QD2) may have a core-shell structure including a core including the above-described nanocrystals and a shell surrounding the core. The shell of the quantum dot may serve as a protective layer to maintain semiconductor properties by preventing chemical denaturation of the core and/or as a charging layer to impart electrophoretic properties to the quantum dot. The shell may be single or multi-layered. Examples of the shell of the quantum dot include metal or non-metal oxides, semiconductor compounds, or combinations thereof.

For example, the oxides of the metal or non-metal include SiO ₂ , Al ₂ O ₃ , TiO ₂ , ZnO, MnO, Mn ₂ O ₃ , Mn ₃ O ₄ , CuO, FeO, Fe ₂ O ₃ , Fe ₃ O ₄ , Examples may include binary compounds such as CoO, Co ₃ O ₄ , NiO, or ternary compounds such as MgAl ₂ O ₄ , CoFe ₂ O ₄ , NiFe ₂ O ₄ , and CoMn ₂ O ₄ , but the present invention is limited thereto. That is not the case.

In addition, the semiconductor compounds include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnSeS, ZnTeS, GaAs, GaP, GaSb, HgS, HgSe, HgTe, InAs, InP, InGaP, InSb, AlAs, AlP, AlSb, etc. However, the present invention is not limited thereto.

Quantum dots (QD1, QD2) may have a full width of half maximum (FWHM) of the emission wavelength spectrum of about 45 nm or less, preferably about 40 nm or less, more preferably about 30 nm or less, and within this range, color purity or Color reproducibility can be improved. Additionally, since the light emitted through these quantum dots is emitted in all directions, the optical viewing angle can be improved.

In addition, the shape of the quantum dots (QD1, QD2) is not particularly limited to those commonly used in the art, but more specifically, spherical, pyramidal, multi-arm, or cubic nanometers are used. Forms such as particles, nanotubes, nanowires, nanofibers, and nanoplate-shaped particles can be used. Quantum dots (QD1, QD2) can control the color of the light they emit depending on the particle size, and accordingly, the quantum dots can have various emission colors such as blue, red, and green.

Additionally, the light control layer (CCL) may further include a scatterer (SP). The first light control unit (CCP1) may include a first quantum dot (QD1) and a scatterer (SP), and the second light control unit (CCP2) may include a second quantum dot (QD2) and a scatterer (SP). The third light control unit CCP3 may not include quantum dots but may include a scatterer SP.

Scatterers (SP) may be inorganic particles. For example, the scatterer (SP) may include at least one of TiO ₂ , ZnO, Al ₂ O ₃ , SiO ₂ , and hollow silica. The scatterer (SP) includes any one of TiO ₂ , ZnO, Al ₂ O ₃ , SiO ₂ , and hollow silica, or is selected from TiO ₂ , ZnO, Al ₂ O ₃ , SiO ₂ , and hollow silica. It may be a mixture of two or more substances.

The first light control unit (CCP1), the second light control unit (CCP2), and the third light control unit (CCP3) each include a base resin (BR1, BR2, BR3) for dispersing quantum dots (QD1, QD2) and scatterers (SP). may include. The first light control unit (CCP1) includes a first quantum dot (QD1) and a scatterer (SP) dispersed in the first base resin (BR1), and the second light control unit (CCP2) includes a first base resin (BR1) dispersed in the second base resin (BR2). It may include dispersed second quantum dots (QD2) and scatterers (SP). The third light control unit CCP3 may include scatterers SP dispersed in the third base resin BR3.

The base resin (BR1, BR2, BR3) is a medium in which quantum dots (QD1, QD2) and scatterers (SP) are dispersed, and may be made of various resin compositions that can generally be referred to as binders. For example, the base resins (BR1, BR2, BR3) may be acrylic resin, urethane resin, silicone resin, epoxy resin, etc. The base resin (BR1, BR2, BR3) may be a transparent resin. In one embodiment, each of the first base resin (BR1), the second base resin (BR2), and the third base resin (BR3) may be the same or different from each other.

Meanwhile, a first barrier layer (BFL1) may be provided between the encapsulation layer (TFE) and the light control layer (CCL). The first barrier layer (BFL1) may serve to prevent penetration of moisture and/or oxygen. The first barrier layer BFL1 may block the light control units CCP1, CCP2, and CCP3 from being exposed to moisture and/or oxygen. The first barrier layer BFL1 may cover the first to third light control units CCP1, CCP2, and CCP3. A second barrier layer (BFL2) may be provided between the light control layer (CCL) and the low refractive index layer (LR). Unlike shown, at least one of the first and second barrier layers BFL1 and BFL2 may be omitted.

Each of the first and second barrier layers BFL1 and BFL2 may include at least one inorganic layer. That is, each of the first and second barrier layers BFL1 and BFL2 may include an inorganic material. For example, the first and second barrier layers BFL1 and BFL2 each include silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, and cerium oxide. and silicon oxynitride or a metal thin film with secured light transmittance. Meanwhile, each of the first and second barrier layers BFL1 and BFL2 may further include an organic layer. Each of the first and second barrier layers BFL1 and BFL2 may be composed of a single layer or multiple layers.

The color filter layer CFL may include first to third filters CF1, CF2, and CF3. Each of the first to third filters CF1, CF2, and CF3 may be arranged to correspond to the first to third light control units CCP1, CCP2, and CCP3 of the light control layer CCL. The first filter CF1 may transmit the second light, the second filter CF2 may transmit the third light, and the third filter CF3 may transmit the first light. For example, the first filter CF1 may be a red filter, the second filter CF2 may be a green filter, and the third filter CF3 may be a blue filter. Each of the first to third filters CF1, CF2, and CF3 may be arranged to correspond to each of the first to third pixel areas PXA-R, PXA-B, and PXA-G.

Each of the first to third filters CF1, CF2, and CF3 may include a polymer photosensitive resin and a pigment or dye. The first filter (CF1) may include a red pigment or red dye, the second filter (CF2) may include a green pigment or green dye, and the third filter (CF3) may include a blue pigment or blue dye. However, the embodiment is not limited to this, and the third filter CF3 may not contain pigment or dye. The third filter (CF3) may contain a polymer photosensitive resin and may not contain pigment or dye. The third filter CF3 may be transparent. The third filter CF3 may be made of transparent photoresist.

Additionally, the first filter (CF1) and the second filter (CF2) may be yellow filters. The first filter (CF1) and the second filter (CF2) may not be separated from each other and may be provided as one unit.

Although not shown, the color filter layer (CFL) may further include a light blocking portion (not shown). The light blocking part may be a black matrix. The light blocking portion may be formed by including an organic light blocking material containing black pigment or black dye or an inorganic light blocking material. The light blocking part may prevent light leakage and distinguish boundaries between adjacent filters (CF1, CF2, CF3).

Figure 5 is an enlarged cross-sectional view of area AA' of Figure 4. Referring to FIG. 5 , the low refractive index layer (LR) may include a base resin (PY), a plurality of non-hollow inorganic particles (AE) dispersed in the base resin (PY), and a void portion (VO). In one embodiment, the void portion (VO) may be derived from porogen. The low refractive index layer (LR) may be formed from a composition that is a mixture of polymer resin, non-hollow inorganic particles (AE), and porogen. The base resin (PY) may be formed by solidifying the polymer resin of the composition, and the porogen may be thermally decomposed to form a void portion (VO). The void portion (VO) formed from the porogen may have a spherical shape. The void portion (VO) may be a vacuum or may contain a very small amount of gas. Meanwhile, the low refractive index layer formed from a composition containing a polymer resin and inorganic particles and not containing a porogen is formed with an amorphous void portion. The low refractive index layer including the amorphous void portion generates cracks and separation from adjacent members (eg, a light control layer and/or a color filter layer), thereby deteriorating fairness and reliability.

For example, the low refractive layer (LR) may be formed by methods such as slit coating, spin coating, roll coating, spray coating, and inkjet printing. However, this is an example, and the method of forming the low refractive layer (LR) is not limited thereto. The low refractive index layer (LR) may be formed using various methods such as a transfer method.

Based on the total weight of the low refractive layer (LR), the weight of the base resin (PY) may be 40 wt% or more and 45 wt% or less. The base resin (PY) may include at least one of an acrylic resin, a silicone resin, and an epoxy resin. For example, the base resin (PY) may include silicone acrylate.

A low refractive index layer (LR) containing a base resin (PY) having a weight of 40 wt% or more and 45 wt% or less can exhibit excellent reliability. In contrast, the low refractive index layer containing a base resin weighing less than 40 wt% contains a relatively excessive weight of non-hollow inorganic particles and/or porogens, resulting in an increase in haze value or a decrease in durability. The low refractive index layer containing a base resin having a weight of more than 45 wt% contains a relatively small weight of non-hollow inorganic particles and/or porogens, so durability is reduced or the predetermined refractive index range is not satisfied.

Based on the total weight of the low refractive layer (LR), the porogen may be provided in an amount of 10 wt% or more and 20 wt% or less. The low refractive index layer (LR) including a void portion (VO) formed from 10 wt% or more and 20 wt% or less of porogen satisfies the refractive index range of the low refractive layer (LR) according to an embodiment and can exhibit excellent durability. . In contrast, a low refractive index layer including voids formed from less than 10 wt% of porogen exhibits a relatively high refractive index (eg, a refractive index greater than 1.25). The low refractive index layer including voids formed from porogen exceeding 20 wt% develops cracks and reduces durability.

The low refractive layer (LR) may have a smaller refractive index than adjacent components. The refractive index of the low refractive layer (LR) may be smaller than the refractive index of the light control layer (CCL). In one embodiment, the refractive index of the low refractive layer (LR) may be 1.21 or more and 1.25 or less. The low refractive index layer (LR) can totally reflect some of the blue light emitted from the light control layer (CCL) toward the color filter layer (CFL) and re-enter the light control layer (CCL). The low refractive index layer (LR) with a refractive index of 1.21 or more and 1.25 or less may exhibit characteristics that facilitate total reflection due to the difference in refractive index from the light control layer (CCL).

Blue light may be light generated from a light emitting device (ED). Some of the blue light may be re-incident into the first light control unit (CCP1) and/or the second light control unit (CCP2) included in the light control layer (CCL). The first light control unit CCP1 can convert the re-incident blue light into red light, and the second light control unit CCP2 can convert the re-incident blue light into green light. Through this recycling of light, the light efficiency of the display device DD can be improved. In one embodiment, the display device DD including a low refractive index layer LR having a refractive index of 1.21 or more and 1.25 or less may exhibit excellent light efficiency.

The low refractive layer (LR) may have a haze value of less than 0.40%. The low refractive index layer (LR) with a haze value of less than 0.40% may be optically transparent. Accordingly, the color control member (CCM) and display device (DD) including a low refractive layer (LR) with a haze value of less than 0.40% can exhibit excellent light efficiency.

In one embodiment, the non-hollow inorganic particles (AE) are particles whose insides are not empty, and the low refractive index layer (LR) does not include hollow inorganic particles whose insides are not empty. Non-hollow inorganic particles (AE) may include at least one of SiO ₂ , MgF ₂ , and Fe ₃ O ₄ . For example, non-hollow inorganic particles (AE) may include SiO ₂ .

Based on the total weight of the low refractive layer (LR), the weight of the non-hollow inorganic particles (AE) may be 40 wt% or more and 45 wt% or less. When the weight of non-hollow inorganic particles is less than 40 wt% based on the total weight of the low refractive index layer, cracks occur in the low refractive index layer. When the weight of non-hollow inorganic particles exceeds 45 wt% based on the total weight of the low refractive index layer, the haze value and refractive index value of the low refractive index layer increase. In contrast, in one embodiment, the low refractive index layer (LR) containing 40 wt% or more and 45 wt% or less of non-hollow inorganic particles (AE) may exhibit excellent optical transparency and durability.

The refractive index of the non-hollow inorganic particles (AE) may be 1.43 or more and 1.46 or less. The low refractive index layer (LR) containing non-hollow inorganic particles (AE) with a refractive index of 1.43 or more and 1.46 or less may have a refractive index of 1.21 or more and 1.25 or less. In one embodiment, the refractive index of the low refractive layer (LR) may be 1.21 or more and 1.25 or less. In contrast, a low refractive index layer containing non-hollow inorganic particles with a refractive index greater than 1.46 or less than 1.43 has a refractive index greater than 1.25 or less than 1.21.

Each of the non-hollow inorganic particles (AE) may be spherical in shape. The diameter of each non-hollow inorganic particle (AE) may be 10 nm or more and 30 nm or less. A low refractive index layer (LR) containing non-hollow inorganic particles (AE) with a diameter of 10 nm to 30 nm may exhibit excellent hardness, improved haze value, and improved specular component excluded (SCE) reflectance. The SCE reflectance is the removal of regular reflected light from the total reflected light. As the SCE reflectance increases, the regular reflected light decreases, and the light is not recycled and is scattered, reducing light efficiency.

Compared to non-hollow inorganic particles with a diameter exceeding 30 nm, non-hollow inorganic particles (AE) with a diameter of 30 nm or less can be evenly dispersed in the low refractive index layer (LR). Evenly dispersed non-hollow inorganic particles (AE) exhibit high uniformity, and the surface roughness of the low refractive layer (LR) can be reduced. The low refractive index layer (LR) with reduced surface roughness can have improved haze value and SCE (Specular Component Excluded) reflectance. Accordingly, the color control member (CCM) and the display device (DD) including a low refractive layer (LR) including non-hollow inorganic particles (AE) with a diameter of 30 nm or less can exhibit excellent light efficiency.

In contrast, a low refractive index layer containing non-hollow inorganic particles with a diameter of less than 10 nm may not be easy to manufacture due to the process. In a low refractive index layer containing non-hollow inorganic particles with a diameter of more than 30 nm, uniformity decreases and surface roughness increases within the low refractive index layer. Accordingly, a low refractive index layer comprising non-hollow inorganic particles with a diameter greater than 30 nm exhibits high haze values, high SCE reflectance, and low intensity.

Figure 6 shows non-hollow inorganic particles (AE) according to one embodiment. Referring to FIG. 6, the non-hollow inorganic particle (AE) may include a first functional group (R10). In non-hollow inorganic particles (AE), a first functional group (R10) may be bound to the surface. In Figure 6, three first functional groups (R10) are shown, but the number of first functional groups (R10) is not limited thereto.

The first functional group (R10) of the non-hollow inorganic particle (AE) and the functional group of the base resin (PY, Figure 5) may be combined. For example, the first functional group (R10) may include a hydroxy group, and the base resin (PY) may include an acryloyl group. The hydrogen atom of the hydroxy group of the first functional group (R10) is removed and combined with the acryloyl group of the base resin (PY), thereby forming the second functional group (R11) on the surface of the non-hollow inorganic particle (AE). . For example, the second functional group (R11) may be represented by the following formula (1).

[Formula 1]

In Formula 1, is the position bound to the surface of the non-hollow inorganic particle (AE). Based on the same volume, compared to non-hollow inorganic particles with a diameter exceeding 30 nm, non-hollow inorganic particles (AE) with a diameter of 30 nm or less may have an increased surface area. Non-hollow inorganic particles (AE) with a relatively small diameter may be provided in greater numbers than non-hollow inorganic particles with a relatively large diameter, based on the same volume of the low refractive index layer, so that the surface area can be increased. The surface area of the non-hollow inorganic particles (AE) may be increased, thereby increasing the bond between the first functional group (R10) of the non-hollow inorganic particles (AE) and the functional group of the base resin (PY). Accordingly, the low refractive layer (LR) can exhibit improved haze value and excellent durability.

Hereinafter, a color control member and a display device including the same according to an embodiment of the present invention will be described in detail with reference to examples and comparative examples. The example shown below is an example to aid understanding of the present invention, and the scope of the present invention is not limited thereto.

Table 1 below shows the weight of the base resin, inorganic particles, and porogen and the diameter of the inorganic particles in the low refractive index layer of Comparative Example 1 and Example 1. The inorganic particles used were SiO ₂ particles. Comparative Example 1 includes hollow inorganic particles with an empty interior, and Example 1 includes non-hollow inorganic particles with a filled interior. Example 1 satisfies the weight range of the base resin, inorganic particles, and porogen according to one example.

Base resin (wt%) Inorganic particles (wt%) Porogen (wt%) particle diameter
(nm, hollow/non-hollow) Comparative Example 1 47 44 9 130 (hollow) Example 1 42.5 42.5 15 20 (non-hollow)

Referring to Table 1, it can be seen that the weight of the base resin in Example 1 satisfies the range of 40wt% to 45wt% based on the total weight of the low refractive layer. 40 wt% or more and 45 wt% or less may be the weight range of the base resin according to one embodiment. In Example 1, it can be seen that the weight of the non-hollow inorganic particles satisfies the range of 40 wt% to 45 wt% based on the total weight of the low refractive layer. 40 wt% or more and 45 wt% or less may be the weight range of the non-hollow inorganic particles according to one embodiment. In Example 1, it can be seen that the porogen satisfies the range of 10 wt% to 20 wt% based on the total weight of the low refractive index layer. Additionally, in Example 1, it can be seen that the diameter of the non-hollow inorganic particles satisfies the range of 10 nm to 30 nm. 10 nm or more and 30 nm or less may be the diameter range of the non-hollow inorganic particles according to one embodiment.

In Comparative Example 1, the weight of the base resin is greater than the weight of the base resin according to an example, and the weight of the porogen is less than the weight of the porogen according to an example. Additionally, the diameter of the hollow inorganic particles in Comparative Example 1 is larger than the diameter of the non-hollow inorganic particles according to one embodiment.

Table 2 below shows the evaluation of viscosity, solid content, refractive index, haze, adhesion, surface roughness, and SCE reflectance in the low refractive index layers of Comparative Example 1 and Example 1 in Table 1. The refractive index was measured using the M-2000V Elipsometer at a wavelength of 550 nm, and the haze was measured using the NDH-2000(N) manufactured by Nippon Denshoku. Surface roughness was measured using Park Systems' NX20 Atomic Force Microscope, and the reflectance of SCE was measured using Konica Minolta's CM-2600D under standard light source D65.

The smaller the surface roughness value, the smoother the surface, and the larger the value, the rougher the surface. Adhesion evaluation follows the standard specifications of ASTM D3359 and involves cutting samples to evaluate the degree of damage. For cutting, YOSHIMITSU's product YCC-230/1 was used. According to ASTM D3359, the adhesion evaluation criteria range from 0B to 5B, with 0B meaning that the damage to the sample is 65% or more, and 5B meaning that the damage is 0%. Meanwhile, 4B means that the degree of damage to the sample is less than 5%.

Comparative Example 1 Example 1 Viscosity (cP) 3.0 3.0 Solid content (%) 12 13 refractive index 1.23 1.23 Haze (%) 0.48 0.39 adhesion 5B 5B surface roughness 10.61 2.36 SCE reflectance (%) 0.44 0.40

Referring to Table 2, the low refractive index layer of Comparative Example 1 including hollow inorganic particles with an empty interior and the low refractive index layer of Example 1 including non-hollow inorganic particles with an empty interior have similar levels of viscosity, refractive index, and It can be seen that it shows adhesion and contains a similar amount of solid content. The higher the adhesive strength of the low-refractive layer, the better the bonding strength with adjacent members (eg, light control units).

The low refractive index layer of Example 1 includes a void portion formed by providing a porogen, and may exhibit a refractive index similar to that of the low refractive index layer of Comparative Example 1 including hollow inorganic particles. As described above, the reliability of the low refractive index layer containing hollow inorganic particles is reduced due to moisture and/or gas entering the layer through the hollow portion. In contrast, in one embodiment, a low refractive index layer including voids derived from non-hollow inorganic particles and porogens filled inside may exhibit excellent reliability while maintaining the desired refractive index.

Referring to Table 2, it can be seen that compared to the low refractive index layer of Comparative Example 1, the low refractive index layer of Example 1 had improved haze value, surface roughness, and SCE reflectance. The low refractive index layer of Example 1 includes non-hollow inorganic particles filled inside and void portions derived from porogen, and includes non-hollow inorganic particles with a relatively small diameter. Accordingly, it is judged that the low refractive index layer of Example 1 showed excellent haze value, surface roughness, and SCE reflectance.

The low refractive index layer of Comparative Example 1 included hollow inorganic particles with a relatively large diameter, and the uniformity of the hollow inorganic particles in the low refractive index layer was low. Accordingly, it is determined that the low refractive index layer of Comparative Example 1 showed high haze value, surface roughness, and SCE reflectance.

Figures 7a and 7b are images taken of the low refractive index layer of Comparative Example 2 using a scanning electron microscope (SEM). The low refractive index layer of Comparative Example 2 does not contain a porogen, and is prepared by mixing inorganic particles and a polymer resin in a solvent, and forming a void portion by evaporating the solvent. Accordingly, in the low refractive index layer of Comparative Example 2, the void portion was formed in an amorphous form.

Referring to FIG. 7A, it can be seen that the low refractive index layer including an amorphous void part has a floating (FT) with an adjacent member. Referring to FIG. 7B, it can be seen that a crack (CT) has occurred in the low refractive index layer including an amorphous void portion. Accordingly, in one embodiment, a low refractive index layer including spherical voids derived from porogen can exhibit excellent reliability.

Figure 8 is a graph showing the strength of the low refractive layer according to the diameter of non-hollow inorganic particles. In Figure 8, the non-hollow inorganic particles are SiO ₂ particles with a diameter of 20 nm. Strength was measured using a Nano-indenter from Anton Paar.

Referring to FIG. 8, it can be seen that the smaller the diameter of the non-hollow inorganic particles, the better the strength of the low refractive index layer. Accordingly, in one embodiment, it is determined that a low refractive index layer containing non-hollow inorganic particles with a diameter of 10 nm or more and 30 nm or less will exhibit excellent durability.

Figure 9 is a graph showing the refractive index of the low refractive layer according to the weight of the porogen, and the refractive index was measured using the product M-2000V Elipsometer at a wavelength of 550 nm. In Figure 9, the dotted line L10 parallel to the vertical axis indicating the refractive index indicates the point where the weight of porogen is 10 wt%. Based on the dotted line L10 in the graph of FIG. 9, the left side is an area where the weight of porogen is less than 10 wt%, and the right side is an area where the porogen weight is more than 10 wt%.

Referring to FIG. 9, it can be seen that the low refractive index layer including a void portion derived from porogen provided at 10 wt% or more and 20 wt% or less has a refractive index of 1.21 or more and 1.25 or less. Accordingly, in one embodiment, the refractive index of the low refractive index layer including the void portion derived from the porogen provided at 10 wt% or more and 20 wt% or less may be 1.21 or more and 1.25 or less.

Referring to FIG. 9, it can be seen that the refractive index of the low refractive index layer including a void portion derived from porogen provided in less than 10 wt% is greater than 1.25. It is believed that as a relatively small weight of porogen is provided, the void portion derived from the porogen decreases, resulting in a refractive index exceeding 1.25. Meanwhile, as described above, cracks occur in the low refractive index layer containing voids derived from porogen provided in excess of 20 wt%, thereby reducing durability.

Figures 10 and 11 show the strength and refractive index according to the weight of non-hollow inorganic particles. In Figures 10 and 11, the non-hollow inorganic particles are SiO ₂ particles with a diameter of 20 nm. The intensity was measured using a Nano-indenter from Anton Paar, and the refractive index was measured using a product M-2000V Elipsometer at a wavelength of 550 nm. In Figures 10 and 11, the dotted line L40, parallel to the vertical axis showing the refractive index, represents the point where the weight of the non-hollow weapon is 40 wt%, and the dotted line L45 represents the point where the weight of the non-hollow weapon is 45 wt%. In the graphs of FIGS. 10 and 11, the left side of the dotted line L40 is a region where the weight of non-hollow inorganic particles is less than 40 wt%, and the right side of the dotted line L45 is a region where the weight of non-hollow inorganic particles is more than 45 wt%.

Referring to FIG. 10, it can be seen that the low refractive index layer with a weight of non-hollow inorganic particles of 40 wt% or more exhibits excellent strength. Referring to FIG. 11, it can be seen that the low refractive index layer in which the weight of non-hollow inorganic particles is 40 wt% or more and 45 wt% or less exhibits a refractive index of 1.21 or more and 1.25 or less. In one embodiment, the weight of the non-hollow inorganic particles may be 40 wt% or more and 45 wt% or less, and the refractive index of the low refractive layer may be 1.21 or more and 1.25 or less. Meanwhile, when the weight of the non-hollow inorganic particles exceeds 45 wt%, it can be seen that the refractive index of the low refractive layer exceeds 1.25.

Figures 12 and 13 are graphs showing the haze value and SCE reflectance of the low refractive layer according to the diameter of the non-hollow inorganic particles. The non-hollow inorganic particles in the low refractive index layer of FIGS. 12 and 13 are SiO ₂ particles with a diameter of 20 nm. In addition, in the low refractive index layer of FIGS. 12 and 13, the base resin was provided at a weight of 42.5 wt%, the non-hollow inorganic particles were provided at a weight of 42.5 wt%, and the porogen was provided at a weight of 15 wt%.

Referring to FIG. 12, it can be seen that as the diameter of the non-hollow inorganic particles increases, the haze value of the low refractive layer increases. It can be seen that the low refractive index layer in which the non-hollow inorganic particles have a diameter of 10 nm or more and 30 nm or less has a haze value of less than 0.40%. Referring to FIG. 13, it can be seen that as the diameter of the non-hollow inorganic particle increases, the SCE reflectance of the low refractive index layer increases. It can be seen that the low refractive index layer whose non-hollow inorganic particles have a diameter of 10 nm or more and 30 nm or less exhibits a relatively small SCE reflectance. Accordingly, in one embodiment, a low refractive index layer containing non-hollow inorganic particles with a diameter of 10 nm or more and 30 nm or less may exhibit improved haze value and SCE reflectance.

A display device in one embodiment may include a display element layer and a color control member disposed on the display element layer. The color control member may include a light control layer including quantum dots, a color filter layer disposed on the light control layer, and a low refractive index layer disposed between the light control layer and the color filter layer. The low refractive index layer may include a base resin, non-hollow inorganic particles dispersed in the base resin, and a void portion derived from a porogen. Non-hollow inorganic particles may be particles with a filled interior. Based on the total weight of the low refractive layer, the weight of the non-hollow inorganic particles may be 40 wt% or more and 45 wt% or less. A low refractive index layer containing non-hollow inorganic particles filled inside satisfies a predetermined refractive index range and can exhibit excellent reliability. In addition, the low refractive index layer containing voids derived from porogen can exhibit excellent processability by preventing lifting and cracking.

Although the present invention has been described above with reference to preferred embodiments, those skilled in the art or have ordinary knowledge in the relevant technical field should not deviate from the spirit and technical scope of the present invention as set forth in the claims to be described later. It will be understood that the present invention can be modified and changed in various ways within the scope of the present invention.

Therefore, the technical scope of the present invention should not be limited to what is described in the detailed description of the specification, but should be defined by the claims.

CCM: Color control member QD1, QD2: Quantum dots
CCL: Light control layer CFL: Color filter layer
LR: low refractive index layer PY: base resin
AE: Non-hollow inorganic particles VO: Void part

Claims (20)

A light control layer containing quantum dots;
a color filter layer disposed on the light control layer; and
a low refractive index layer disposed between the color filter layer and the light control layer; Including,
The low refractive layer is
base resin;
A plurality of non-hollow inorganic particles dispersed in the base resin and filled inside; and
Void portion derived from porogen; Includes,
Color control in which the weight of the base resin is 40 wt% to 45 wt% based on the total weight of the low refractive layer, and the weight of the non-hollow inorganic particles is 40 wt% to 45 wt% based on the total weight of the low refractive layer. absence. According to claim 1,
A color control member in which the low refractive index layer does not include hollow inorganic particles. According to claim 1,
The void portion is a color control member having a spherical shape. According to claim 1,
A color control member wherein each of the non-hollow inorganic particles has a diameter of 10 nm to 30 nm. According to claim 1,
Based on the total weight of the low refractive layer, the porogen is provided in an amount of 10 wt% or more and 20 wt% or less. According to claim 1,
A color control member in which the void portion is formed by thermal decomposition of the porogen. According to claim 1,
A color control member wherein the low refractive layer has a refractive index of 1.21 or more and 1.25 or less. According to claim 1,
A color control member wherein the low refractive layer has a haze value of less than 0.40%. According to claim 1,
The base resin is a color control member including at least one of acrylic resin, silicone resin, epoxy resin, urethane resin, and imide resin. According to claim 1,
The non-hollow inorganic particles are a color control member containing at least one of SiO ₂ , MgF ₂ , and Fe ₃ O ₄ . According to claim 1,
A color control member wherein the refractive index of the non-hollow inorganic particles is 1.43 or more and 1.46 or less. According to claim 1,
A color control member in which the functional group of the base resin is bonded to the surface of the non-hollow inorganic particle. According to claim 1,
A color control member wherein the refractive index of the low refractive layer is smaller than the refractive index of the light control layer. display element layer; and
a color control member disposed on the display element layer; Including,
The color control member is
A light control layer containing quantum dots;
a color filter layer disposed on the light control layer; and
a low refractive index layer disposed between the color filter layer and the light control layer; Including,
The low refractive layer is
base resin;
A plurality of non-hollow inorganic particles dispersed in the base resin and filled inside; and
Void portion derived from porogen; Includes,
The weight of the base resin is 40 wt% to 45 wt% based on the total weight of the low refractive layer, and the weight of the non-hollow inorganic particles is 40 wt% to 45 wt% based on the total weight of the low refractive layer. . According to claim 14,
A display device in which the low refractive index layer does not include hollow inorganic particles. According to claim 14,
A display device wherein the low refractive layer has a refractive index of 1.21 or more and 1.25 or less. According to claim 14,
A display device wherein each of the non-hollow inorganic particles has a diameter of 10 nm to 30 nm. According to claim 14,
The display element layer includes a light-emitting element that emits first light,
The light control layer includes a first light control unit including a first quantum dot for converting the first light into second light, a second light control unit for converting the first light into third light, and transmitting the first light. A display device including a third light control unit. According to clause 18,
The color filter layer includes a first filter corresponding to the first light control unit, a second filter corresponding to the second light control unit, and a third filter corresponding to the third light control unit. According to clause 18,
The first light is blue light,
The first quantum dot converts the blue light into red light, and the second quantum dot converts the blue light into green light.

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